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The '''erg''' is a unit of energy and work (physics)|work equal to 10−7 joules. It originated in the Centimetre gram second system of units|centimetre–gram–second (CGS) system of Units of measurement|units. It has the symbol ''erg''. The erg is not an SI unit. Its name is derived from ''ergon'' (’έργον) a Greek language|Greek word meaning ''work or task''. An erg is the amount of work done by a force of one dyne exerted for a distance of one centimeter. In the CGS Unit of measurement#Base and derived units|base units, it is equal to one gram centimeter-squared per second-squared (g·cm2/s2). It is thus equal to 10−7 joules or 100 nanojoules (nanojoule|nJ) in SI units. An erg is approximately the amount of work done (or energy consumed) by one common house fly performing one "push up", the leg-bending dip...
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